CN108407273A - Has the device thermoplastic method for adhering film of three-dimension curved surface - Google Patents

Abstract

This invention provides a thermoplastic film application method for devices with three-dimensional curved surfaces. It conducts technical research on the external shape design of the device before cutting and utilizes the thermoplastic limit of the film material to apply film to devices with large curved surfaces. It can also be applied to irregular three-dimensional curved surfaces.

Description

Thermoplastic film sticking method for device with three-dimensional curved surface

technical field

The technology of the present invention relates to the field of touch control, and in particular refers to a technology for applying thermoplastic films to devices with large curvature three-dimensional structures.

Background technique

The bonding technology of the touch module has gradually evolved from the initial flat film to the one-dimensional curved surface and the two-dimensional curved surface. Finally, for larger curved surfaces, the over-mold surface decoration (OMD) technology can be used for film application.

The bonding of the touch module is usually two-dimensional or three-dimensional film at room temperature. Under special circumstances, it may be necessary to use a thermosetting optical adhesive (OCA) as a heat-pressed film. Since there are currently two-dimensional or three-dimensional devices with greater curvature on the market that need to be used as touch modules, optical film materials or other materials, a thermoplastic molding method is required.

Contents of the invention

The present invention provides a method for attaching a thermoplastic film to a device with a three-dimensional curved surface. groove, the device has a three-dimensional curved surface, and there is a working space in the thermoplastic bonding machine, which is used to thermally bond the film to the device, which includes a heating device and a clamp, and the heating device is used to heat the The film softens it, and the clamp is used to fix the film and perform a pressing action to bond the film to the device. b. Fix the film with the clamp. c. Using the heating device to heat the film. d. Set the mold in the working space, and make the groove face the film. e. Put the device in the groove with the three-dimensional curved surface facing the film. f. The clamp performs the pressing action to attach the film to the three-dimensional curved surface.

The present invention provides a method for attaching a thermoplastic film to a device with a three-dimensional curved surface. It conducts technical research on the appearance design of the device before cutting, including material properties, stress distribution, thickness change and final product specification quality, and utilizes the heat of the film material. The plastic limit can be used as a device film for large curved surfaces, and can be applied to irregular three-dimensional curved surfaces.

Description of drawings

FIG. 1 is a flow chart of a preferred embodiment of the method for attaching a thermoplastic film to a device with a three-dimensional curved surface according to the present invention.

FIG. 2 is a cross-sectional schematic diagram of a mold and a device of a preferred embodiment of a method for applying thermoplastic film to a device with a three-dimensional curved surface according to the present invention.

Fig. 3 is a cross-sectional schematic diagram 2 of the mold and the device of a preferred embodiment of the thermoplastic film lamination method for the device with a three-dimensional curved surface of the present invention.

FIG. 4A is a schematic diagram 1 of a preferred embodiment of a thermoplastic film attachment method for a device with a three-dimensional curved surface according to the present invention.

FIG. 4B is a schematic diagram 2 of a preferred embodiment of a thermoplastic film attachment method for a device with a three-dimensional curved surface according to the present invention.

FIG. 4C is a third schematic diagram of the manufacturing process of a preferred embodiment of a thermoplastic film attachment method for a device with a three-dimensional curved surface according to the present invention.

FIG. 4D is a schematic diagram 4 of a preferred embodiment of a thermoplastic film attachment method for a device with a three-dimensional curved surface according to the present invention.

Reference signs:

film 1

Thermoplastic Laminating Machine 2

workspace 21

Heating unit 22

Fixture 23

mold 3

groove 31

device 4

3D surfaces 41

central area 411

Surface Area 412

Borderlands 413

Press action 91

Laser cutting action 92

Step 100～160

center point A

edge point B

Pivot C

Height H

width D

Detailed ways

The technical means and structure adopted by the present invention are hereby illustrated in detail with respect to the embodiments of the present invention. The features and functions are as follows, so as to facilitate a complete understanding, but it should be noted that the content does not constitute a limitation of the present invention.

Please also refer to Fig. 1, Fig. 2, Fig. 3, Fig. 4A, Fig. 4B, Fig. 4C and Fig. 4D, which are the method flow chart, mold and Device cross-sectional schematic diagram 1, schematic diagram 2, and process schematic diagrams 1 to 4. The thermoplastic film sticking method of tool three-dimensional curved surface of the present invention comprises the following steps:

Step 100: Provide a film 1, a thermoplastic laminating machine 2, a mold 3 and a device 4, the mold 3 has a groove 31 for accommodating the device 4, the device 4 has a three-dimensional curved surface 41, The thermoplastic bonding machine 2 is used for thermally bonding the film 1 and the device 4 . In one embodiment, the film 1 can be a polymer film, a metal oxide film or a nano-sol film.

Please refer to FIGS. 4A to 4C , the thermoplastic bonding machine 2 has a working space 21 inside, and the thermoplastic bonding process can be performed in the working space 21 . The thermoplastic laminating machine 2 includes a heating device 22 and a clamp 23 , the heating device 22 can heat the film 1 to an appropriate temperature, so as to soften the film 1 for subsequent film laminating operations. The clamp 23 is used to fix the film 1 , and can perform a pressing action 91 to bond the film 1 to the device 4 . In this embodiment, the three-dimensional curved surface 41 is a concave surface, but it is not limited thereto, and it can also be a convex surface or an irregular curved surface.

Step 110 : the thermoplastic laminating machine 2 uses the clamp 23 to fix the film 1 .

Step 120: The thermoplastic laminating machine 2 heats the film 1 to a proper temperature by using the heating device 22 . The appropriate temperature can soften the surface of the film 1 without affecting the structural properties of the film 1 itself.

Step 130 : Set the mold 3 in the working space 21 , and make the groove 31 face the film 1 . Please refer to Figure 4A, the clamp 23 can fix the film 1, and use the heating device 22 to heat the film 1 to an appropriate temperature, and the mold 3 is arranged directly below the film 1, and the groove 31 faces the film 1 , and the groove 31 can assist the thermoplastic bonding machine 2 to perform thermoplastic bonding on the film 1 .

Step 140 : Put the device 4 in the groove 31 and make the three-dimensional curved surface 41 face the film 1 .

Step 141: The thermoplastic lamination machine 2 fixes the mold 3. Referring to FIG. 4B , the position of the mold 3 is fixed to ensure stability during the pressing action 91 .

Step 150 : the clamper 23 performs the pressing action 91 to bond the film 1 to the three-dimensional curved surface 41 . Please refer to FIG. 4C , the film 1 is bonded to the three-dimensional curved surface 41 by high-pressure bonding (for example, Compressed dry air, CDA).

In an embodiment of the present invention, the step 150 further includes: wherein the three-dimensional curved surface 41 defines a central region 411 from the center to the edge of the three-dimensional curved surface 41, a curved surface region 412 and an edge region 413, the pressing action 91 The bonding of the film 1 and the three-dimensional curved surface 41 is carried out sequentially from the central region 411 , the curved surface region 412 to the edge region 413 .

2 and 3 at the same time, the edge of the device 4 has a height H and a width D from the edge of the groove 31. In order to avoid the risk of air bubbles between the three-dimensional curved surface 41 and the film 1 in the thermoplastic film, heat The plastic angle can be greater than 1.6 of the design angle of the device. Therefore, by controlling the height H and the width D, the design angle of the device can meet the ideal thermoplastic angle requirements. In this embodiment, the center of the central region 411 defines a center point A, the edge region 413 defines an edge point B, the edge of the groove 31 defines a fulcrum C, and the connection between the center point A and the edge point B There is a first included angle α between the line direction and the horizontal direction, and there is a second included angle β between the line direction of the center point A and the fulcrum C and the horizontal direction, and the second included angle β is larger than the first included angle. 1.6 times the angle α. The horizontal distance from the center point A to the edge point B of the three-dimensional curved surface 41 is 25.4 millimeters (mm). As can be seen from Fig. 3, the vertical distance from the center point A to the edge point B is 4.3 millimeters, the horizontal distance from the center point A to the groove 31 fulcrum C is 28.4 millimeters, and the vertical distance from the center point A to the groove 31 fulcrum C is 28.4 millimeters. The distance is 7.8mm. Therefore, it can be calculated that the first included angle α between the center point A and the edge point B of the three-dimensional curved surface 41 and the horizontal direction is 9.6 degrees (device design angle), and the center point A of the three-dimensional curved surface 41 reaches the groove 31 The second included angle β between the fulcrum C and the horizontal direction is 15.4 degrees (thermoplastic angle), making the second included angle β greater than 1.6 times of the first included angle α, which meets the ideal thermoplastic angle requirement.

The probability of air bubbles in the three-dimensional curved surface film can be predicted from the pressing sequence, and the pressing sequence can be effectively controlled by designing the size of the groove 31 . In one embodiment, the film sticking sequence is extended from the central area 411 to the curved area 412 and the edge area 413 . By controlling the width and height of the groove 31 in the present invention, problems such as optical abnormality caused by excessive stretching of the film 1 during lamination can be avoided.

Step 160 : Perform a laser cutting operation 92 to align the film 1 with the edge of the three-dimensional curved surface 41 . Please refer to FIG. 4D , after the pressing action 91 is completed, laser cutting technology can be used to align the film 1 with the edge of the three-dimensional curved surface 41 .

Through the above detailed description, it can be fully demonstrated that the purpose and efficacy of the present invention are progressive in implementation, have great industrial value, and are a new invention that has never been seen on the market before, and fully comply with the invention patent Requirements, please file an application in accordance with the law. The above descriptions are only examples of the present invention, and are not intended to limit the implementation and protection scope of the present invention. For those skilled in the art, they should be able to realize that all equivalent replacements and The solutions obtained by obvious changes shall all be included in the protection scope of the present invention.

Claims (8)

1. A device thermoplastic film sticking method with three-dimensional curved surface, is characterized in that, comprises the following steps: a. Provide a film, a thermoplastic bonding machine, a mold and a device, the mold has a groove for accommodating the device, the device has a three-dimensional curved surface, and the thermoplastic bonding machine has a working Space for thermoplastic lamination of the film and the device, which includes a heating device and a clamp, the heating device is used to heat the film to soften it, and the clamp is used to fix the film and perform a pressing acting to engage the film with the device; b. using the clamp to fix the film; c. using the heating device to heat the film; d. setting the mold in the working space, and making the groove face the film; e. placing the device in the groove with the three-dimensional curved surface facing the film; f. The clamp performs the pressing action to attach the film to the three-dimensional curved surface. 2. The thermoplastic film attachment method for a device with a three-dimensional curved surface as claimed in claim 1, wherein the step f. further comprises: wherein the three-dimensional curved surface defines a central area from the center to the edge of the three-dimensional curved surface, a curved surface area, and an edge area, the pressing action sequentially performs lamination of the film and the three-dimensional curved surface from the central area, the curved surface area to the edge area. 3. The device thermoplastic film sticking method with a three-dimensional curved surface as claimed in claim 2, wherein the center of the central region defines a center point, the edge region defines an edge point, the edge of the groove defines a fulcrum, and the center point There is a first included angle between the direction of the line connecting the edge point and the horizontal direction, and a second included angle between the direction of the line connecting the central point and the fulcrum and the horizontal direction, and the second included angle is larger than the first included angle. 1.6 times the angle. 4. The method for attaching a thermoplastic film to a device with a three-dimensional curved surface as claimed in claim 1, further comprising the following steps after step f.: g. performing a laser cutting action to align the film with the edge of the three-dimensional curved surface. 5. The method for attaching a thermoplastic film to a device with a three-dimensional curved surface as claimed in claim 1, further comprising the following steps after step e.: e1. The thermoplastic laminating machine fixes the mould. 6 . The thermoplastic film attachment method for a device with a three-dimensional curved surface as claimed in claim 1 , wherein the three-dimensional curved surface is a concave surface. 7. The method for attaching a thermoplastic film to a device with a three-dimensional curved surface as claimed in claim 1, wherein the three-dimensional curved surface is a convex surface. 8. The thermoplastic film attachment method for a device with a three-dimensional curved surface as claimed in claim 1, wherein the three-dimensional curved surface is an irregular curved surface.